ALAMIN: Bakit zigzag o liku-liko ang mga kalsada sa bundok?

Naranasan n’yo na bang mahilo habang nasa road trip sa bundok?
Marahil iyan ay dahil sa zigzag o liku-likong kalsada.
Pero bakit nga ba zigzag at hindi diretso ang disenyo ng mga daan sa bundok?
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